@article{JDM_1929__38_145824,
     author = {G. Thomsen},
     title = {Bericht \"uber differentialgeometrische {Untersuchungen} zur {Kugelgeometire.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {95--112},
     publisher = {mathdoc},
     volume = {38},
     year = {1929},
     zbl = {55.0427.01},
     url = {http://geodesic.mathdoc.fr/item/JDM_1929__38_145824/}
}